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Stereoscopic video transmission systems have now evolved from 2D video systems and have been commercialized for a number of application areas, driven by developments in stereo capturing and display technology. With the new developments in autostereoscopic display technology, these stereo systems need to further advance towards 3D video systems. In contrast to all previous video coding technologies, 3D video data requires a number of new assumptions and novel technology developments. This paper discusses the evolution from 2D to stereo video and finally to 3D video systems and highlights some of the major new challenges for 3D Video. Finally, an evaluation framework for 3D video technology is shown, that addresses these challenges and is used by ISO- MPEG for standardizing the best 3D video coding solution.